Guild Wars 2

You should NEVER, ever, EVER open a chest, black lion, physical in-game, consortium, or otherwise, and get light/medium armor if you’re a guardian. You should NEVER open a chest and get a rifle if you’re a warrior. You should NEVER pay real money for a chest, only to open it and get armor you cannot use. You should NEVER open an event chest and get a precursor you can’t use.

Chests need to be set up so that they only give you items you can use.

A few problems I see with this:
-Warriors can use rifles
-You buy chests using gems, not real money (buying gems with real money is an optional game mechanic)

I believe in the situations you’re suggesting, the armour/items are either account bound or can be sold at the trading post. In the situation where the item is soulbound, I can see this being more of an issue. However, given you can sell anything you obtain through those methods, you can use the items to make gold.